Osteosarcoma pelvis LSBU

Description: Radiology case 4411-3221 84 year old woman with pain in the right hip.
There is an irregular lytic process of the right ilium with relative sparing of the iliac crest. The process breaches the cortex between and including the anterior iliac spines. The endosteal margins of the lytic process are ill-defined, having a wide zone of transition between normal and abnormal bone. The right hemipelvis shows a general abnormality of bone architecture with slight expansion of the inferior section of ilium, right ischium and pubis. There is loss of cortico-medullary distinction with patchy increase in bone density and loss of the normal bone architecture. Protrusio-acetabuli on the right side, indicates the longer-term process softening the bone on that side.